posted by .

evaluate the trigonometry function using its period as an aid cos(-7pi/3)

  • trig -

    7/3 = 2 1/3
    2 pi is a full circle
    so we have gone around clockwise two circles and pi/3
    so we really want cos (-pi/3)
    draw a picture of that,60 degrees below the x axis in quadrant 4
    the cosine is cos -60 degrees which is 1/2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    Eliminate the parameter (What does that mean?
  2. Trig

    Evaluate the trigonometric function using its period as an aid. cos 5pi how would i go about finding the period and what is a period?
  3. trig

    Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (7pi/12)
  4. Trigonometry

    Hi, I need help with this question: Use the addition and subtraction formulas ti fubd the exact values of the trigonometric ratios: cos(-7pi/12) Okay, I'm just having trouble with a rather basic part of the question... I wrote cos(pi/4 …
  5. trig

    Solve the equation for cos theta-tan theta=0 for greater than or egual to zero but less than 2pi. Write your answer as a multiple of pi, if possible form the following choices: pi , 5pi A. --- ---- 4___ 4 B. pi 3pi 5pi 7pi ----- '----- …
  6. trig

    Determine if the value of each trig function is positive, negative, zero, or undefined. a) tan 310 degrees b) cos 7pi/6 c) sin -245 degrees d) sec( -7/2)
  7. Trigonometry

    How do you find the exact value of cos -7pi/12 without using a calculator to change radian to degree
  8. Trigonometry - Checking my work

    Find the sum of the three smallest positive values of theta such that 4 cos^2(2theta-pi) =3. (Give your answer in radians.) Hi guys, I've been struggling with this problem. Here's my thinking about the problem: we can rewrite the equation …
  9. Pre-Calc

    Evaluate the two trigonometric functions using its period as an aid. 1. cos (9pi/2) = ?
  10. Math

    Evaluate the two trigonometric functions using its period as an aid. 1. cos (9pi/2) = ?

More Similar Questions